Film oxygenators

Aluminum alloys are essentially unaffected by dissolved oxygen in pure water up to 350°F (180°C). Although much of aluminum s corrosion resistance is due to the presence of an adherent oxide film, oxygen is not necessary to form the layer. Direct reaction with water can pro-... 

The first CL sensor for oxygen analysis was reported by Freeman and Seitz in 1978 [6], Collins and Ross-Pehrsson [12] investigated the effect of polymer type, pH, and metal catalyst incorporated within the film. Oxygen levels as low as 2.4 ppm in nitrogen have been detected using the oligomer fluoropolyol as the support matrix for immobilizing luminol, KOH, and the metal catalyst Fe2(S04)3. A sensor... 

The EVOH-COOH compatibilizer use determines the increasing of the blend film oxygen permeability that becomes two orders of magnitude higher than that of a coextruded film with the same percentage of EVOH [298], That means that EVOH-COOH acts that an interfacial agent. 

In the film oxygen diffuses to the flame front, and combustion products and heat are transported to the surrounding atmosphere. The position of the boundary designated by °o is determined by convection. A stagnant atmosphere places the boundary at an infinite distance from the fuel surface. 

Detailed analysis of the steady-state voltage chatacter-istics of both the thick film oxygen sensor and the crucible type oxygen sensor are shown. 

A cross-section schematic drawing of the newly-developed thick film oxygen sensor is shown in Figure 2. The platinum film heater is embedded in the alumina substrate. Electrical resistance of the heater is about 6 ohms at room temperature. 

Figures 5 and 6 present the experimental results obtained with the thick film oxygen sensor.

Figure 2. Schematic drawing of thick film oxygen sensor...

Figure 6. Experimental voltage curves for thick film oxygen sensor (A/F vs V curve)...

Thick film oxygen sensor with catalytic electrode (when 1-0). Substituting 1=0 into Equation 20 yields... 

Sensor voltage characteristics of the thick film oxygen sensor. Experimental data show that sensor voltage characteristics of the thick film oxygen sensor vary greatly with the value of the sensor current. 

In the case of a larger sensor current, the model for the thick film oxygen sensor used in this analysis showed favorable possibilities for a "lean oxygen sensor."... 

Methods (1) ASTM D2619 (2) ASTM D2896 (3) ASTM D4742 by the thin film oxygen uptake test (TFOUT) at 160°C (4) hot tube test at 290 °C (Okhawa and Seto, 1984) (5) ASTM D2714, N = Newton (6) ASTM D4172 Numbers borate (carbonate)... 

A combination of ZDDP and hard-core RMs leads to a synergistic effect of metallic detergents on the degradation of ZDDP. These phenomena are observed in many tests and can be explained in terms of (a) the acid neutralization property of hard-core RMs that leads to the prevention of decomposition of ZDDP (in the valve train wear test and the thin film oxygen uptake test), (b) the competitive adsorption of detergents that reduce the effective concentration of ZDDP on the metal surface (in the four-ball test), (c) the formation of mixed films on the metal surface, formed through the decomposition of ZDDP in the presence of hard-core RM s (the coefficient of friction in the Falex wear test). 

D 4739 D 4742 Base Number Determination by Potentiometric Titration. Oxidation Stability of Gasoline Automotive Engine Oils by Thin Film Oxygen Uptake (TFOUT)... 

Landrock, A.H., and G.A. Wallace. 1955. Discoloration of fresh red meat and its relationship to film oxygen permeability. Food Technol. 9 194-196. 

Oxygen valves Bonded film Oxygen atmosphere... 

The recirculadng perfusion apparatus consists of a double pump (Masterflex with 7016 heads, Cole-Parmer, Chicago, IL) to and from a falling film oxygenator (Fig. 1). One inlet tube comes from a botde of... 

M.E. Schrader, J. Phys. Chem. 78 (1974) 87 SD, UHV-evaporated copper and silver films, oxygen-free water droplets. 

Fig. 4 Two-film oxygen mass transfer theory at liquid interface. Note Pg = partial pressure of oxygen in bulk gas phase Pi = partial pressure of oxygen at the interface Cg = saturation concentration of dissolved oxygen at the interface C = dissolved oxygen concentration in bulk liquid.)...

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